Equivalence between squeezed-state and twin-beam communication channels

被引：11

作者：

D'Ariano, GM ^{[1
]}

Sacchi, MF ^{[1
]}

机构：

[1] Univ Pavia, Dipartimento Fis A Volta, I-27100 Pavia, Italy

来源：

MODERN PHYSICS LETTERS B | 1997年 / 11卷 / 29期

关键词：

D O I：

10.1142/S0217984997001511

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We show the equivalence between two different communication schemes that employ a couple of modes of the electromagnetic field. One scheme uses unconventional heterodyne detection, with correlated signal and image band modes in a twin-beam state from parametric downconversion. The other scheme is realized through a complex-number coding over quadrature-squeezed states of two uncorrelated modes, each detected by ordinary homodyning. This equivalence concerns all the stages of the communication channel: the encoded state, the optimal amplifier for the channel, the master equation modeling the loss, and the output measurement scheme. The unitary transformation that connects the two communication schemes is realized by a frequency conversion device.

引用

页码：1263 / 1275

页数：13

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